Wrist-pin-bearing holder



w. H. FENNEMAN WRIST PIN BEARING HOLDER Filed Jan. 6, 1927 llllllll 7 l .A ,/6 'y @M YPatented Oct. 2, 192,8.

i y ffissama FENIIEMAN. j

i weleens-BEARING HOLDER. Y f' prlieatiei'led January 611922'- efil'NQ-- 159452:

This invention relates to new and usefulv improvement in vpitmans and wrist-piny bearings, and particularlysuch devices used inv well drilling rigs.

The wrist-'pin bearing is ordinarily held against the wrist-pin by means of a wooden wedge,but in view of the fact that this wedgel tion is to providea novel andimproved l broken away.

Y the line 3 3 of Figure 1.

means for holding the bearing in proper engagement with the wrist-pin, and which will quickly release the bearing, to permit removal'of the pitman from the wrist-pin.

Another object isvto providev a.' device of this character which will firmly hold the bearing in place, and which is equipped with means for holding the holding means out of the way, when removing the pitman from the wrist-pin, such bearing being alsol provided with means for holding it out of engagement with the pin, while removing the pitman, or restoring thesame to position.

Other objects and advantages will be apparent from the following description, when taken in connection drawing.`

In the drawing: 'Y Figure 1 is an elevation of a portion of a pitman, showing the bearing holding means in operative position, the

with the accompanying Figure 2 is a side view of the same. Figure 3 is a horizontal sectional view on Referring` particularly to the accompanyi ing drawing, 10 represents a portion of the pitman of a well drilling rig, having the vwrist-pin receiving opening 11therein, and

' the bearing block 12 seated in said opening and bearing on said wristpin 13. Formed transversely through the pitman, above the l opening 11 is an opening 14, and disposed in said opening is the bearing engaging arm 15, said. arm being pivotally supported in the opening by means of the bolt 16. The opening 14 is of suficient width toA permit a limited vertical swinging movement of the Y v arm. The upper endof the opening 11 communicateswith the intermediate portion of the lower sideof the opening 14, whereby the bearing block is arranged to be vengaged by the lower edge face of said arm. On each of pitman being WILLIAM iE. FENNEMern ory Terr, CALIFORNIA, A'ss'IG'Non'ro 'MARY KArIIERINn l Y theiwider faces of the pitman there is arranged a coil spring 17, each having its upper end secured to the pitman, and its lower end secured to the'bearing block V12. Disposed through the'pitman, below the opening 11,

and in parallel relation thereto, is a bolt 18,

one end of which is formed with an eye 19, to which is pivotally lconnect-ed one end of a lever 20. This lever is formed with a bend 21 which is arranged` to pass inwardly of the against the edge face of the pitman.` Pivotally connected to the free end of thearml, which projects beyond ythe end ofthe opening 14, is a yoke 22, and engaged in the bight of said yoke is -one end of the oppositely threadedv adjusting screw 23. A locking nut 24 isengaged on: the said Vend of the screw,

and is arranged to vbe rotated into frictional" gagement vwith the adjacent end of the en yoke 22, to maintain the screw in adjusted position. yPivotally connected'to the angle pivot of the lever, when said lever is moved of the before-mentioned bend V21 is a yoke-25,

and threaded into the bight portion thereof is the other end of the screwl23, an integral Vwrench Vengaging nut portion v26 being `formed on the intermediate portion of the screw whereby to permit rotary movement thereof. Connected to the free .end of thev arm 15, and to thepitman, above the opening 14, is a 'coil spring 27, which serves to hold the arm in elevated position while the pitman is being-removed from, or replaced on the wrist-pin.

When the screwhas been properly adjusted, andthe lever 20 swung upwardly, the spring 27 will holdthe arm 15in elevated poist-ion,

drawn down to force the bearing block firmlyv against the` wrist-pin, and by reason of the construction-of the lever 20, andits connection with the yoke 25, the pivot connection of said yoke will be thrown ofi' center whereby to hold the lever against accidental outward swinging,which would tend t0 release the arm from vthe bearing block. 'What is claimed is:

A pitman having an upper wrist-pin opening, a bearing blockin the opening, a transverse opening intersecting the upper` endnof lio thewrist-pin opening, YIneens for normally 5 theupper end of thel block, resilient Ineens fol-normally urging the arm away from the block, aneye bolt disposed transverselyl through the pitman beneath `the bearing block opening, a bent lever pivotally mounted on the eye bolt, 'a yokeV pivote/lily connected to the free end ofthe said larm, k:i yoke pivotvally connected With the lever adjacentits pivotal connection with 'the eye bo1t, and-an v oppositely threadedsbolt engaged n the adjacent ends of said yokes. Y

'Intestimony whereof7 I aix my signziture.

WILLIAM H'.V FENNEMAN. 

